Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6701927bdba67fe…

MALICIOUS

PDF

83.4 KB Created: 2021-05-28 13:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9d61eb8294533471e26db6e55d1f3237 SHA-1: 5b8f101148ebb10bd3c5cab3104b2f28c2aba48c SHA-256: f6701927bdba67fee7a35f348c6fd61bbcf883ce6bfede6641bd7e658239e7e4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://leonvi.ru/strik?utm_term=anket+doldurarak+para+kazanma+ek%25C5%259Fi+s%25C3%25B6zl%25C3%25BCk', appears to be a lure for users seeking to earn money by filling out surveys. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=anket+doldurarak+para+kazanma+ek%25C5%259Fi+s%25C3%25B6zl%25C3%25BCk PDF link annotation
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/7351578.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/b3ec2e588538b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_606c608df19ab.pdfIn PDF document text
    • https://nasakavagupudo.weebly.com/uploads/1/3/4/7/134766537/suzewadafuw-kutuvorekex-wolegobako-kotex.pdfIn PDF document text
    • https://jujogiva.weebly.com/uploads/1/3/4/4/134494804/8168573.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/xufatosut_sojisexagotit.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/7548657.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/961844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_604b9694c2279.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460678/normal_60b0a058ac5d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db3be98-3319-48a2-a2b9-371db8b24636/it_essentials_chapter_8_exam_answers_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3622dac4-790c-4d76-b458-dc284aee4b3d/what_is_a_deviant_career.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e70775-2ead-4e42-9e90-7a66d26eda14/27276105736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdf2b62-6b50-4f20-ba0d-d14c1db4ec3f/pelawijutirejakilozagaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0385a53c-70e4-4e27-8708-522b7ae46615/nora_roberts_bride_series_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94da994-2fb0-415f-8636-54577a537660/warehouse_safety_rules_for_visitors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b2afd5-2922-4de3-8cac-e63a74da502d/budijegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24291c6e-3923-4a27-b5bd-5aa32c34a3a8/cloud_support_engineer_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c44302-a893-4fa6-ae45-38ec52f7c41d/wunder_von_bern_doping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81a33db-1905-4431-af77-95eb10d1dde1/41753448432.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 5716 bytes
SHA-256: 2c7b4d37deb798a7262647ea61333262c5c2f97442fc37ed8f09af751b9c4ed6
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 12224 bytes
SHA-256: 8a4253f43dbe3ceb7c072629cad853ff559a981c6e8c706b517280dc2492021c
font_02_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e